1 var DESCRIPTORS = require('../internals/descriptors');
2 var global = require('../internals/global');
3 var isForced = require('../internals/is-forced');
4 var inheritIfRequired = require('../internals/inherit-if-required');
5 var defineProperty = require('../internals/object-define-property').f;
6 var getOwnPropertyNames = require('../internals/object-get-own-property-names').f;
7 var isRegExp = require('../internals/is-regexp');
8 var getFlags = require('../internals/regexp-flags');
9 var stickyHelpers = require('../internals/regexp-sticky-helpers');
10 var redefine = require('../internals/redefine');
11 var fails = require('../internals/fails');
12 var setInternalState = require('../internals/internal-state').set;
13 var setSpecies = require('../internals/set-species');
14 var wellKnownSymbol = require('../internals/well-known-symbol');
16 var MATCH = wellKnownSymbol('match');
17 var NativeRegExp = global.RegExp;
18 var RegExpPrototype = NativeRegExp.prototype;
22 // "new" should create a new object, old webkit bug
23 var CORRECT_NEW = new NativeRegExp(re1) !== re1;
25 var UNSUPPORTED_Y = stickyHelpers.UNSUPPORTED_Y;
27 var FORCED = DESCRIPTORS && isForced('RegExp', (!CORRECT_NEW || UNSUPPORTED_Y || fails(function () {
29 // RegExp constructor can alter flags and IsRegExp works correct with @@match
30 return NativeRegExp(re1) != re1 || NativeRegExp(re2) == re2 || NativeRegExp(re1, 'i') != '/a/i';
33 // `RegExp` constructor
34 // https://tc39.github.io/ecma262/#sec-regexp-constructor
36 var RegExpWrapper = function RegExp(pattern, flags) {
37 var thisIsRegExp = this instanceof RegExpWrapper;
38 var patternIsRegExp = isRegExp(pattern);
39 var flagsAreUndefined = flags === undefined;
42 if (!thisIsRegExp && patternIsRegExp && pattern.constructor === RegExpWrapper && flagsAreUndefined) {
47 if (patternIsRegExp && !flagsAreUndefined) pattern = pattern.source;
48 } else if (pattern instanceof RegExpWrapper) {
49 if (flagsAreUndefined) flags = getFlags.call(pattern);
50 pattern = pattern.source;
54 sticky = !!flags && flags.indexOf('y') > -1;
55 if (sticky) flags = flags.replace(/y/g, '');
58 var result = inheritIfRequired(
59 CORRECT_NEW ? new NativeRegExp(pattern, flags) : NativeRegExp(pattern, flags),
60 thisIsRegExp ? this : RegExpPrototype,
64 if (UNSUPPORTED_Y && sticky) setInternalState(result, { sticky: sticky });
68 var proxy = function (key) {
69 key in RegExpWrapper || defineProperty(RegExpWrapper, key, {
71 get: function () { return NativeRegExp[key]; },
72 set: function (it) { NativeRegExp[key] = it; }
75 var keys = getOwnPropertyNames(NativeRegExp);
77 while (keys.length > index) proxy(keys[index++]);
78 RegExpPrototype.constructor = RegExpWrapper;
79 RegExpWrapper.prototype = RegExpPrototype;
80 redefine(global, 'RegExp', RegExpWrapper);
83 // https://tc39.github.io/ecma262/#sec-get-regexp-@@species